Optical member, lighting device, and display device

Abstract

An optical member 24 includes an optical sheet 15 and a frame (a light blocking member) 16. The optical sheet 15 includes a pair of plate surfaces and one of the plate surfaces is a light entering plate surface 15a through which light enters and another one of the plate surfaces is a light exit plate surface 15b through which the light exits. The optical sheet 15 includes an optical component that provides an optical effect on transmission light. The frame 16 has a light blocking property and extends along an edge section 15c of the optical sheet 15 and the edge section 15c is put within the frame 16. Accordingly, a frame width can be reduced.

1 . An optical member comprising:
 an optical sheet including a pair of plate surfaces, one of the plate surfaces being a light entering plate surface through which light enters and another one of the plate surfaces being a light exit plate surface through which the light exits, and the optical sheet including an optical component that provides an optical effect on transmission light; and   a light blocking member having a light blocking property and extending along an edge section of the optical sheet and the edge section being put within the light blocking member.   
     
     
         2 . The optical member according to  claim 1 , wherein
 the optical sheet is made of material having linear expansion coefficient greater than that of the light blocking member, and   the edge section is put within the light blocking member such that the optical sheet is applied with tension to be pulled outwardly along the plate surfaces.   
     
     
         3 . The optical member according to  claim 1 , wherein the optical sheet includes the optical component that forms an uneven structure on one of the light entering plate surface and the light exit plate surface. 
     
     
         4 . The optical member according to  claim 1 , wherein the light blocking member is arranged to cover the light entering plate surface and the light exit plate surface of the edge section of the optical sheet. 
     
     
         5 . The optical member according to  claim 1 , wherein the optical sheet includes optical sheets that are stacked on each other, and the optical member further comprising a plate surface fixing member that is between the plate surfaces of the optical sheets at the edge sections. 
     
     
         6 . The optical member according to  claim 1 , wherein the optical sheet includes optical sheets that are stacked on each other, and the optical member further comprising an edge surface fixing member that is in contact with edge surfaces of the optical sheets and extends over the edge surfaces. 
     
     
         7 . A lighting device comprising:
 the optical member according to  claim 1 ;   a light source that supplies light to the optical sheet; and   a light guide plate having outer peripheral edge surface and a pair of plate surfaces, a part of the outer peripheral edge surface being a light entering edge surface through Which light from the light source enters and one of the plate surfaces being a light guide plate light exit plate surface that is opposite the light entering plate surface of the optical sheet and through which the light exits, wherein   the light blocking member includes a light guide plate pressing section that presses edge section of the light guide plate from a light guide plate light exit plate surface side.   
     
     
         8 . The lighting device according to  claim 7 , further comprising a casing in which the optical sheet, the light blocking member, and the light source are arranged, wherein the casing includes a side section that is in contact with an outer surface of the light blocking member. 
     
     
         9 . A display device comprising:
 the lighting device according to  claim 7 ; and   a display panel displaying an image with using light supplied by the lighting device, wherein the light blocking member includes a panel receiving section that receives an edge section of the display panel.